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From Jędrzej Dąbrowa (JIRA) <j...@apache.org>
Subject [jira] [Created] (GROOVY-8122) Wrong invokation target of static method
Date Wed, 15 Mar 2017 12:41:41 GMT
Jędrzej Dąbrowa created GROOVY-8122:
---------------------------------------

             Summary: Wrong invokation target of static method
                 Key: GROOVY-8122
                 URL: https://issues.apache.org/jira/browse/GROOVY-8122
             Project: Groovy
          Issue Type: Bug
          Components: groovy-runtime
    Affects Versions: 2.4.9
            Reporter: Jędrzej Dąbrowa


Given following set of java classes:

{code:title=Interface.java|borderStyle=solid}
public interface Interface {
    class ExternalInterface implements Interface {}

    static Interface provide() {
        new Throwable().printStackTrace();
        return new ExternalInterface();
    }
}
{code}

{code:title=MyInterface.java|borderStyle=solid}
public abstract class MyInterface implements Interface {

    private static class MyInterfaceImpl extends MyInterface {}

    public static MyInterface provide() {
        return new MyInterfaceImpl();
    }
}
{code}

And below Groovy code:

{code:title=Test.groovy|borderStyle=solid}
class Test {
    static void main(String[] args) {
        MyInterface myInterface = MyInterface.provide()
    }
}
{code}

It yields following result:

{noformat}

Exception in thread "main" org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot
cast object 'Interface$ExternalInterface@24a35978' with class 'Interface$ExternalInterface'
to class 'MyInterface'
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:405)
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:319)
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:232)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:603)
	at Test.main(Test.groovy:9)
{noformat}

Stacktrace during creating object of invalid type is:
{noformat}
at Interface.provide(Interface.java:7)
	at Interface$provide.call(Unknown Source)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
	at Test.main(Test.groovy:9)
{noformat}

To me this seems to be a bug. Or is this expected behavior?



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